Homework Help: chemistry

Posted by kellie on Friday, September 17, 2010 at 9:22pm.

a. How many atoms of hydrogen are in 25.0 g of ammonia (NH3)? Use the format 6.02E+23 for 6.02 x 1023

b. How many atoms of nitrogen are in the same amount of ammonia?

chemistry - DrBob222, Friday, September 17, 2010 at 9:38pm
How many moles in 25.0 g NH3?
moles = grams/molar mass.
There are 6.02E23 molecules in 1 mole of NH3 and there are 3 H atoms per molecule. Therefore,
6.02E23 x (25.0/molar mass) x (3 atoms H/molecule NH3) = ??

b is done the same way but there is only 1 N atom per molecule NH3.
chemistry - harnam, Thursday, September 23, 2010 at 3:53am
26.572E1023

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